Colin Farrell has denied his girlfriend is pregnant.The 31-year-old 'Alexander' star has slammed reports 22-year-old medical student Muireann McDonell is having his baby.Colin's representative Danica Smith said: "She is not pregnant."A source claimed last week: "She's just under three months along now. They're trying to keep it quiet."Colin already has a three-year-old son, James, from his relationship with American model Kim Bordenave.The 'Phone Booth' star has previously said fatherhood inspired him to change his wild partying ways and check into rehab to be treated for an addiction to prescription painkillers.Colin - who was renowned for his womanising, drinking and drug use - said: "I was burning the candle at both ends and the flames met in the middle. But now I have a new-found appreciation of life. I wasn't suicidal but I never had much of a will to live for a long time."Now I want to watch my son grow up, be his friend and his father, and hang around with him. He's the greatest priority in my life."The 'Miami Vice' star was briefly married to English actress Amelia Warner, but they split just a few months after tying the knot in July 2001.Colin stars alongside Edward Norton and former girlfriend Lake Bell in new movie 'Pride and Glory'.